Use Enum Class for Qt Protobuf Enum

I notice that generated C++ code from protobuf enum is using `enum`. Is it possible to use `enum class` for protobuf enum so that the same enum value can be declare multiple time? for example:

message Foo {
  enum Bar {
    Unknown = 0;
    ValOne = 1;
    ValTwo = 2;
  }
  Bar bar = 1;
  
  enum Baz {
    Unknown = 0;
    ValThree = 1;
    ValFour = 2;
  }
  Baz baz = 2;
}

There are some discussion on the protobuf github repo but looks like it did not implemented.
https://github.com/protocolbuffers/protobuf/issues/67
https://github.com/protocolbuffers/protobuf/issues/1079

Does Qt is using some kind of custom code generation? or this issue must be solved at upstream ?